Altitude warning signal system



July l, 1952 J, s, BAKER 2,602,111

` ALTITUDE WARNING sIGNAL` SYSTEM 2,60Z,l l l July 1, 1952 J. s. BAKERALTITUDE WARNING SIGNAL SYSTEM 2 SHEETS-SHEET 2 Filed Sept. 28, 1948Patented July 1, 1952 UNITED STATES ALTITUDE WARNING SIGNAL SYSTEM JohnS. Baker, Chicago, Ill., assignor to Cook Electric Company,` Chicago,Ill., a corporation f Illinois Application September 28,

13 ClalmS. (Cl. 177-311) This invention relates yto a new and improvedaltitude warning signal system for aircraft and the like.

Increasing speeds of certain types of aircraft make it desirable, if notessential, to warn the pilot automatically when predetermined altitudelevels are reached. The velocity at which these ships travel causes highaltitude levels to be reached quickly, and the safety of the pilot maybe endangered unless a signal is provided vto y assure that he will beadvised upon reaching the high altitude level at which, for example,oxygen becomes necessary for sustained flight, or the high altitudelevel representing the maximum service ceiling of the aircraft.

Accordingly, it isfan object of the invention to provide a new warningsignal system capable of energizing a signal at `a predeterminedaltitude level, and, although the signal may be deenergized after thepilot' has received the proper 20 Warning, it will again be energized ifthe plane goes to and above a higher predetermined altitude level whereanother warning is desirable, or goes below either level and returns toand goes above the same again. 1

A still further object of the invention is to provide an altitudewarning signal system capable of accurate operation and which will notbe disturbed by night vibration to which it will be subjected. 5,0

A still further object of the invention is to provide a warning signalsystem that isvsimple and has a minimum number of parts.

Other objects and advantages will be apparent from the followingdetailed description .wheng5 taken in connection with the accompanyingdrawings which form a part hereof.

In the drawings: f f

Figure 1 is a wiringdiagram illustrating one embodiment of theinvention; and 4 *40 Fig. 2 is a wiring diagram illustrating anotherembodiment of the invention. f

The illustration in Fig. 1 includes a novel type of aneroid switch Iadapted to close at a plurality` of altitude levels and to energize aseries of ciri 45 cuits to effect operation of a signal designatedbroadly as 35. Although this aneroid maybe constructed in any preferredway, it is shown as having an annular housing 3 with opposed flexiblewalls 4 and 5 forming a chamber! whichi'50 is evacuated so that alowering of atmospheric pressure will cause walls 4 and 5 to iiexoutwardly and engage the contacts of switches 'I and 8. Switches I and 8each havefaset of novelly spaced contacts, designated I Il 'and Il 55'and this somewhat fluttering action of wall 4,

1948, serial No. 51,545

and 'IU and 1I, respectively, arranged with respect to walls 4 land 5 sothat these walls will engage contacts Il) and'IIl before engagingcontacts II and 'II. While the spacing between these walls and thesecontacts may be adjustable in order that switches 1 and B mayloe closedat `different altitude levels if so desired, the arrangement showninFig. 1 contemplates switch 'I closing, for example, at ten thousandfeet altitude, and switch 8 closing at forty thousand feet altitude.Switch 'I has its contacts vII) and II in an actuating circuit I2 thatincludes an actuating relay .coil I4. When wall 4 initially ilexesoutwardly.

it will rst be brought into a `somewhat iluttering engagement withcontact III. Due to vibration the engagement will befmade and broken anumber of times before the outward flexing-'will reach a stage causingthe wall toupress rmly against contact IIJ and keep the yengagementclosed.

Thereafter, wall 4 will initially engage contact II. The first surge ofcurrent will be through Wire-I3,'relay I 4, wires I5 and I6, contact II,

Vwall 4and to groundthrough return connection at I'I. Immediately,actuating relay I 4is energized and contact of switch I9 engages springI8. This closes the circuit which includes wires 2| and 22 and contactI0. This circuit functions as a holding circuit for `relay I4 to keep itenergized after the first impulse'of current through relay I4. Withoutthis arrangement it will be apparent that the initial iiutteringengagement of wall 4 withl contact I0 would cause a repeated make andbreak ofthe relay circuit, and consequently, achattering at relay I 4until thewall 4 moves far enough to firmly press against contact Ill. Byhaving an open circuit initially for contact III, the flutteringactionof the wall 4 as it ilexes outwardly is ineffective and engagementis completed only after further flexing of Wall 4 causes a firm contactbetween the wall and contact I0. Thereafter a single touch of wall 4with contact `II energizes relay I4 suiicientl'y long, although theaction is almost instantaneous, to cause a lock-up of relay I4k throughswitch I9.

- A single circuit. comprises a wire 26, a switch 2'I having a contact28 and a contact spring 29, a'wire 3,0, a switch 3l having a contact 32and a contact spring 33, a wire 34, signal and return line 36. Thearrangement is preferably such that switch 21 is normally closed andswitch 3| is normally opened. Hence, when switch 3| is closed by theactuation of relay I4, the signal circuit 25 is closed and the signalelement 35,

`whether audibler Aor visual, will be actuated. If

aneroid 2 is calibrated to close switch 1, say at a ten thousand feetaltitude, signal 35 will immediately operate and warn the pilot or otherattendant that the aircraft has reached and is passing beyond thisaltitude level.

To enect a terminatio'n or cut-out of the signal 55, a cut-out circuit45 is provided. This cut-out circuit lglcomprises a switch 4I havingcontacts t2 and firfwire 5, a portion of coil designated 44 of a controlrelay 52, wire 46, contact 49 of switch 4S, contact spring 55 and wire5I. When relay Iii is energized by the closing of actuating circuit I2at aneroid I, switch 48 is also closed, the signal circuit 25 also isclosed and signal 35 isactuated.

It will remain actuated untilcut-out circuit 40 is closed at switch 4I,which actuates relay 52 and opens switch 2l. circuit is opened and thesignal 35v is stopped.

In order to keep signal circuit 25 deenergized` Y spring 62 is connectedby wire Gtogroundconnection Consequently, a mere touch of the release orcut-outA switch All-I by the pilot will,

Immediately, the signal.

4 of wires 86 and 81. When aneroid I closes switch 8, actuation of relay83 opens switch E9 at contact 6I and closes it at contact i8. During thebreak and make period, the rst holding circuit 55 for relay 52 is openedand coil iti of relay 52 is immediately deenergized. Switch 2'? is,therefore, allowed to close and the signal circuit 25 iseneractuatedntil "deenergi'zed'by cutout circuit 5I through the closingof switch Iii. Instead of the current ilowing through coil t only ofrelay 52,

promptly open signal circuit25 vand switch 2l,

and this switch 2 will `be held opened by holding circuit 55 keepingcoil lill of relay 52 energized. This condition continues as long asaneroid I keeps actuating circuit AI-2Hclosed -at switch ,'When aneroidI opens switch l,v as -will be the oase if the plane drops Abelow thelevel at which aneroid -I.is-calibratedrto closeV switch V1,- relay I4is immediately deenergized-and allfof .the switches I5, SI, l5 areopened. Coil i4-of relay 152 is then Vdeenergized and the holdingcircuit 55 -is broken.

`Switch 2l then closes, but the Ysignal vcircuit 25 includes switch 3|which openswhen relay VI4 of actuating circuit .I2 is deenergized.Howeven if Ythe plane again crosses the altitude level at which Yaneroid I is calibrated to closeswitch "I, switch 3l will be immediatelyclosed andsignal 35 actuated. t will-continue to signal-the planesascent above this predeterminedV altitude `level until switch 4| isactuated.

A second setting for aneroid I is represented by It includes contactshence, the first surge of current through wire 12 of actuating circuit13 will energize relay V53 and close the contacts v'Ht and 15 of switchl5.

, Contact 'i4 connects with contact 'i0 by means of wire Ti'. Switch 6!also includes contact 18 which normally is open but which engagescontact vspring 52 when relay 53 is energized. y It will be presumedthat the setting of aneroid, i represented by switch 3 is for a greateraltitude level than the setting represented by switch l.

Consequently, when switch 8 is'closed by aneroid I, coil 134 will beenergized because switch 7 will 'he' ,closed and relay I5 will be heldenergized.

Contact 18 is connected in a second holding `circuit vfor relay 52. Thissecond holding circuit is designated 8E) and includes a wire iii, Vaswitch `52 having a contact 33 Vand a spring contact 84 ywhich connectsto coil v .of relay 52 by means yswitch-4I..

ment with contact 5I.v Y Fig. Zillustrates ainodied'structure.

it will now viiowthrough both coils and 85, wire 8l, wire', closedswitch 82, wire 8 I, contact T3', ,contact spring 52, wire 54 and returnconnecvtion 65; Relay 52 will, therefore, remain locked in actuatedposition to hold switch 2'! open in order to keep signal 35 deenergized.

If it is assumed, for purposes ci illustration only, that switch 'i willbe closed at an altitude level of ten thousand feet and switch 8 will beclosed 'at .-an,altitude ,level of lforty thousand feet, `vsignal 35willbe energized when switch -'iisclcsed and will remain closed at andabove thislevel untill deenergizedby a momentary closing of Signalt willV,then remain inactive until one oi two cenditions-ebtain. First` itwiliclose again if the-plane should ,hrstA drop ybelow ten thousand feetjandagain rise to and above this level. Second, after (itis deenergized byVYoperation of -switch 4I, it will closeagain-,if the pla-ne lrisesabove forty thousand feet. n

v :Provision has been made inthe form o con- -densei J5-bridged acrosscoilsilcl and 85 to prevent relay 52 being-deenergized when contactmoves from contact-,7,8 to contact El upon deenergizationof relay-63.Thus,-switch'2-I is held openand r'signal 35y -isprevented fromoperation -,at;this time; Thecurrentstored up in vthis condenser 95 willgb'e adequate-to maintain coils will and energized long enough toprevent relay 52 from being,r deenergized before holding circuitisfestablished by contact'tZ 'moving into engag l Again, aneroid I isprovided with switches'i and 8 having contacts 10 and IIV andjli) and 'H'respectively in lholding circuits :95, and Q5, switch ,'I-.beingarranged forclosing1at,alowerfaltitude level than switch 8; Aspreviously, contact Il connects by a wire 9? to relay 98 having a returnyconnection 39. Operation of relay 8 closes switch 'ISO havingacontactspring Ici-'and a contact |52.

Switch I5!! with Wires-IGahd IEM constitutes a holdingcircuitfiorfre'lay when wall llfof aneroid lI iirst firmly engagescontact'lt and then contact II. contact IGS and a contact spring `I Bl.Switch ISS is connected by wires H28 and 199 to one side of the linewhile wire YI Ill rconnects it to -a relay I I I by a wire II2 and to anormally closed'switch i I I5 by a wirev H5. `Switch I I5 is included ina signal circuit H8 by a wire H9, a wire IZ, a relay IQI, a wire I22 andreturn vconnection 23.

Signal circuit IIB also includes a normal open 65Y switch 25 having itscontacts E25 and I2? closed` when relay. iZI is actuated. Contact 25connects by awire I28 to signal I2S connected at its other terminal towire i351 shown connected to the positive side of the current supply.Contact '|21 is connected by a wire ISE to the return side 423-011? theline. Consequently, when switch .l is

closed-by aneroid I and actuating circuit 55 is Wire '(59, wire ,105,closedlswitch Ii5, vwiresili Relay 58 also closesfswitch IE5 having thesame as switch 1.

lwill 'and ||6, normally closed switch ||5, wires ||9 and |20, relay|2-|, wire |22 and'r'eturn side |23.

Immediately, switch is-closed'and current will ow from throughvsignal|29, wire |28, switch |25, Wire |3| and return side |23. Signal |29 willcontinue to operate until its circuitv is opened by deenergizing relay I2|. l f

Relay |2| is deenergized by the closing of a switch |having contacts |36and. |31. yContact |31 is connected to the return side |23 of the lineby a wire |38.k Contact |36 is connected by a wire |39 to wire |40. Wire|40 is connected to a normally 'closed switch |4| which is connected bywire |42 to relay The current will flow in this cut-out circuitdesignated |45 rst from wire |09, wire |08, closed switch |05,

wires |0 and ||2, relay wire |42, normally closed contacts |46 and 41,wires |40 and |39, switch |35 and wire 38 to return side |23. With relayA,l actuated, signal circuit ||8 is broken at switch |5 which is thenopened while a holding circuit |48 is closed at switch |4| yby its`contact |49 moving upwardly to engage contact |46 and lift it out ofengagement with contact |41.

The current will ow through holding circuit |48 iirst through wire |09,then wire |08, closed switch |05, wires ||0 and ||2, relay wire |42,contacts |46 and |49, wire |50 and return side |23. This holding circuit|48 will continue to persist and keep relay llllenergized in order tohold switch ||5 open, and consequently, to hold coil |2| deenergized andswitch |25v opened. While coil |2| is deenergized and switch |25 is heldopened, signal |29 cannot operate. If, however thev aircraft should dropbelow the prede- 2 termined altitude level at which Yswitch 1 is closedby aneroid actuating circuit '95 is opened and relay98 is deenergized.Switch V|05 is then opened, which deenergizesrelay and resets switches||5 and |4| so thaty upon a return of the plane to this altitude level,the system will be reestablishedand will function to operate signal |29again. y

If the plane should ascend to th'e second alti- 'tude level at whichaneroid will close switch 8, v actuating circuit 96 will be closed andrelay |5| will be, energized. The operation of switch 8 yis Contact 10will beirst engaged by wall 5. Any fluttering engagement will notcomplete the circuit. When the engagement is firmly made, wall 5 willhave flexed outwardly far enough to engagecontact 1|. This cause thecurrent to flow momentarily through wire |52, coil |5| and wire |53.Actuation of relay |5| closes switches |56 and |51, the former toestablish a holding circuit |58 for relay |5| and the latter to closethe alarm circuit,

' which now includes wire |09, wire |60, switch |51 having contacts |6|and |62, wire |63, normally closed switch |64 having contacts @|65 and|65, wire |20, relay |2|, wire |22 and return connection 23. Againswitch |25 will close to actuate signal |29. i i Y A switch |61,similar' to switch |4|, with normally closed contacts |68 and |69, isprovided in circuit with cut-out circuit |39 by means of wire |10 and awire |1| leading from contacts |68 to relay |12. After signal circuit||8 is vclosed -by the closing of switch |51, actuation of 'switch |35of cut-out circuit |39 causes current to flow through relay |12. Switch|64 is then opened and signal circuit I8 is deenergized.A

A holding circuit |13 is established byk means of movable contact |14 ofswitch |61 engaging contact |68 and then-lifting it from contact |14.

`6 'The current will then flow fromcontact'ill through contact |14, Wire|15 and return'to |23. This condition obtains as'long as the plane is ator above the altitude `levelrepresented by the closing of switch 8. A ssoon as the plane drops below this predetermined level, switch`8 willopen and remain open unless the 'plane againasc'ends to thispredetermined level. If the plane does so ascend, the alarm |29 willagain function and nrequire operation of switch |35 before it Willfbestopped. AS previously stated, signal |29 may be an audible alarm orinstrument carrying a lamp which will light and be visible when thesignal circuit is closed.

It will be observed from the foregoing description that'an altitudewarning signal system has been provided which will operate a warningsignal at a plurality of altitude levels asa plane ascends to theselevels and which signal requires deenergization each time and remainsdeenergized until the plane enters one o f the higher altitude levelsordescends and reenters any one of these levels. The system is extremelyaccurate and sensitive so as to assure operationof 4the signal each timeit is required." The aneroid vand its circuit making parts also assureaccuracy in operation becauseiiight vibration or jarring will not hinderthe movement of the switch parts.

Without further elaboration, the foregoing will so fully explain thegist of my invention-that others may, by applying current knowledge,readily adapt the same for use' under varying conditions of service,Without eliminating certain features, which may properly be saidtofconstitute the essential items of novelty involved,

which items areA intended to be defined and secured to me by thefollowing claims.

1. In an altitude warning signal system, the

combination of an actuating electric circuit having a circuitclosing-aneroid and an actuating device therein, two contacts engageableby said aneroid, one of said contacts being directlycon- Vnected in saidactuating circuit and the other y combination of an aneroid operableataplurality of altitude levels, an actuating electric circuitV foreach' of two predetermined levels and av circuit making and breakingunit in each actuating cir- 'cuit to close the circuit upon anas'centjof` said aneroid beyond said predetermined altitude levels andremain closed above said predetermined altitude levels, an actuatingrelay for each actuating circuit, a signaling circuit common to bothactuating circuits and operable by their said actuating devices. acut-out circuit for said signaling circuit, and a control deviceenergizable by. saidcutout circuit to open saidy signaling circuit.

3. In an altitude warning signal system, the combination of an aneroidoperable at a plurality of altitude levels, an actuating electriccircuitfor each level to be closedat said level and remain closed abovesaid level and a circuit making and breaking unit in each actuatingcircuitl to close the circuit upon an ascent of said-aneroid beyondpredetermined altitude levels, a signaling circuit common to bothactuatingl circuits and operable by the closing of said actuatingcircuits by said circuit making and breaking units, a cut-out circuitfor said signaling circuit, and a control de vice energizable by saidcut-cut circuit to open said signaling circuit.

4. In an altitude warning signal system, the combination of an aneroidoperable at a plurality of altitude levels, an actuating electriccircuit for each of two predetermined levels and a circuit makingandbreaking unit in each actuating circuit to close the circuit upon anascent of said aneroid beyond said predetermined altitude levels andtoremain closed above said levels, a signaling circuit common to bothactuating circuits and operable by the closing of said actuatingcircuits by said circuit making and breaking units, a cut-out circuitfor said signaling circuit, a control device-energizable bysaid cut-outcircuit to open said signaling circuit, and holding circuits controlledby said actuating circuits for keeping said control device actuated andsaid signaling circuit open.

5. In an altitude warning signal system, the combination of an aneroidoperable at a plurality of altitude levels, an actuating electriccircuit for each of two predetermined levels anda circuit making andbreakingunit in each actuatingcir- :i

cuit to close the circuit upon an ascent of said aneroid beyond saidpredetermined altitude levels and to maintain said circuits closed abovesaid levels, a signaling circuit common to both actun ating circuits andoperable by the closing of said i making and breaking unit in eachactuating circuit to close the circuit uponan ascent of said aneroidbeyond said predetermined altitude levels, a signaling circuit common toboth actuating circuits and operable by the closing or said actuatingcircuits, a relay for opening saidsignaling circuit, and a capacitancein parallel with-said relay adapted to maintain actuation of said relayas the aneroid descends below the upper of said two predeterminedaltitudes.

7. In an altitude warning signal system, the

combination of an aneroid operablelat a plurality of altitude levels, arelay for each altitude level adapted to be actuated by the vascent ofsaid aneroid to said altitudelevels, a. signaling circuit closed by theactuation of any oi said relays, a manually operable relayffor openingsaid signaling circuit, and holding circuits controlled by said Y firstrelays for holding said signaling circuit open when opened by saidmanually operable relay.

8. In an altitude warning signal system, thev combination of an aneroidoperable at a plurality of altitude levels, an actuating circuit foreach altitude level adapted to be closed by the ascent of said aneroidto said altitude levels and to remain closed above said altitude levels,a signaling circuitfan operating circuit associated with and operated byeach of said actuating circuits and adapted to close said signalingcircuit when either or all of said actuating circuits are closed, and amanually operated cut-out circuit for` said cp- 8 erating circuitsincluding control devices energizable when said cut-out circuit isclosed to open said operating circuits.

9. In an altitude warning signal system, the

lcombination of vananeroid operable at a plurality of altitude levels,an actuating circuit for each altitude level adapted to be closed by theascent of said aneroid to said altitude levels, a signaling circuit,operating circuits adapted to close said i signaling circuit when eitheror all of said actuating circuits are closed, a cut-out circuit for eachoperating circuit, a control device adapted to open said signallingcircuit, and a holding circuit therefor for each cut-out circuit, saidcontrol device being energized by the closing of the cut-out circuit andremaining closed until opened by one of the actuating circuits.

10. In an altitude Warning signal system including an aneroid, thecombination of an actuating electric circuit having a circuit closingdevice including a plurality of contacts adapted to be closed by theascent of said aneroid beyond `a predetermined altitude level, anactuating relay in said circuit, a plurality of switches adapted to beclosed by said relay when said actuating circuit is closed by saidcircuit closing device, a signal circuit having one of said switchestherein adapted to be closed by said actuating relay, a cut-out circuithaving another of said switches therein also adapted to be closed bysaid actuating relay, a holding circuit having contacts closed by saidaneroid at an altitude below said predetermined altitude alsoV havinganother of said switches in circuit with said contacts closed by saidaneroid adapted to be closed by said actuating relay to hold saidactuating circuit closed, a control relay in said cut-out circuit, andanormally closed switch in said signal circuit adapted to be opened toopen said signal circuit when said control relay is energized.

1l. In an altitude Warning signal system including an aneroid, thecombination of an actuating electric circuit having a circuit closingdevice including a plurality of contacts adapted to be closed by theascent of said aneroid beyond a predetermined altitudelevel, anactuating relay in said circuit, a plurality of switches adapted to beclosed by said relay when said actuating circuit is closed by saidcircuit closing device, a signal circuit having one of said switchestherein adapted to be closed by said actuating relay, a cut-out circuithaving another of said switches therein also adapted to be closed bysaid actuating relay., a holding circuit having contacts closed by saidaneroid at an altitude below said predetermined altitude also havinganother of said switches in circuit With said contacts closed by saidaneroid adapted to be closed by said actuating relay to hold saidactuating circuit closed,

a control relay in said cut-out circuit, a normally closed switch insaid signal circuit adapted to be opened to open said signal circuitwhen said control relay is energized, a holding circuit for saidcontrolkrelay, and a switch adapted to be closed by said control relayto hold said control relay closed as long as `said switch in saidcut-out circuit is held closed byk said actuating relay.

12. In an altitude warning signal system including an aneroid, thecombination of an actuating electric circuit having a circuit closingdevice adapted to be closed by the ascent of said aneroid beyond apredetermined low altitude level, an actuating relay in said circuit, aplurality of switches adapted to be closed by said relay when saidactuating circuit is closed by said circuit closing device, a signalcircuit4 having one of said switches therein adapted to be closed bysaid actuating relay, a cut-out circuit having another of said switchestherein also adapted to be closed by said actuating relay, a holdingcircuit also having another of said switches therein adapted to beclosed by 'said actuating relay to hold said actuating circuit closed, acontrol relay in said cut-out circuit a normally'closed switch in saidsignal circuit adapted to be opened to open said signal circuit whensaid control relay is energized, a holding circuit for said controlrela, a switch adapted to be closed by said control relay to hold saidcontrol relay closed as long as said switch in said cut-out circuit isheld closed by said actuating relay, a second actuating electric circuithaving a circuit closing device adapted after said rst actuating circuitisy closed to be closed by the ascent of said aneroid beyond apredetermined high level, a second actuating relay, a second set ofswitches, said second set of switches being actuable by said secondactuating relay, a second holding circuit for said control relay havingone of the last said switches therein, said switches having a contact insaid rst holding circuit and a contact in said second holding circuit,the movement of said switch from said contact in said first holdingcircuit to said second holding circuit de-energizing said control deviceand closing said signal circuit until said cut-out circuit is againclosed or said second actuating circuit is opened at said aneroid, saidrst actuating circuit remaining closed to keep said signal circuitclosed if not opened by said cut-out circuit before said secondactuating circuit is opened.

13. In an altitude warning signal system, the combination of an aneroidoperable at a plurality of altitude levels, an actuating circuit foreach of two predetermined levels and a circuit making and breaking unitin each actuating circuit to 10 close the circuit upon an ascent of saidaneroid beyond said predetermined altitude levels, a signal circuitcommon to both actuating circuits and operable by the closing of saidactuating circuits, a relay having two energizing series connectedwindings for opening said signaling circuit, the first of said windingsenergizable above the lower of said predetermined altitude levels, andboth of said windings energizable above the upper of said altitudelevels, holding means for keepingsaid relay energized while saidactuating circuits are closed, and capacitanceY means in parallel withsaid windingsof a magnitude to maintain actuation of said relay as theaneroid descends below the'upper of said predetermined altitude levels.

JOI-11N S. BAKER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,127,343 Parlett Aug. 16., 19382,275,883 Bany Mar. 10, 1939 2,439,474 Kennelly Apr. 13, 1948 2,447,625Astin Aug. 24, v1948 2,461,075 Naylor Feb. 1949 2,493,548 Proctor Jan.3, 1950 2,501,793 Sperry Mar. 28, 1950 FOREIGN PATENTS Number CountryDate 601,058 Great Britain Apr. 27, 1948 OTHER REFERENCES Pages 1202 and1203 of Electrical World, vol. 39, No. 23.

Page 164 of Kinks.

